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| Utgitt
| Rueil-Malmaison : Centre International d'Information sur le Gaz Naturel et tous Hydrocarbures gazeux , 1989
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| Omfang
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| Opplysninger
| "Results of an investigation conducted by The Alphatania Group in July and August 1989". "Reprinted by permission of SWEDEGAS AB November 1989"
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